System of distribution.



No. 648,489. Patented May I, I900. W. L. R. EMMET.

SYSTEM OF DISTRIBUTION.

(Application filed Mar. 10, 1899.)

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Urrnn 'TATES \VILLIAM L. R. EMMET, OF SCHENECTADY, NE\V YORK, ASSIGNORTO THE GENERAL ELECTRIC COMPANY, OF NE\V YORK.

SYSTEM OF DISTRIBUTION,

SPECIFICATION forming part of Letters Patent No. 648,489, dated May 1,1900.

Application filed March 10. 1899. Serial No. 708,470. (No model.)

To all whom, it flea/y concern:

Be it known that I, WILLIAM L. R. EMMET, a citizen of the United States,residing at Schenectady, in the county of Schenectady, 5 State of NewYork, have invented certain new and useful Improvements in Systems ofDistribution, (Case No. 668,) of which the following is a specification.The present invention relates to systems 0 distribution in whichcompensators are employed in the well-known two-wire and threewiresystems to transfer energy from one side of a three-wire system to theother as the'load on the two'sides becomes unbalanced, and has for itsobject to arrange the compensators in such manner that they willcompound for drop in both sides of the three-wire system.

In the accompanying drawing, A represents a compound direct-currentgenerator having a shunt-winding F and a series winding F supplyingcurrent to the circuit-mains a 1).

Connected across mains cab is a compensator, comprising two machines BB, with their armatures belted or otherwise mechanically connected, asindicated by the dotted line. The armatures are electrically connectedin series by wire F, from which extends the neutral wire or conductor G.The machines are provided with shunt-field windings F F connected acrossthe outside branch mains a b. Included in this circuit is an adjustableresistance R. If desired, these fields maybe included in separatecircuits. The load is represented by lamps L; but any other form oftranslating device may be employed.

Thus far the arrangement is the same as the well-known compensatingsystem; but in addition to this I provide series coils F and .F forcompounding the machines B B. Coil F is connected in series with main aand strengthens the field of the machine B to compensate for drop whenthe load is, increased between main a and neutral wire G. Coil F isconnected in series with main Z) and varies the field strength ofmachine B when the load between main Z2 and neutral wire G changes.- Theratio of compounding of the machines can be adjusted by varying thecurrent flow in coils F and F in the usual way by means of theadjustable shunts S S The method of operation is as follows: As-

sume, for example, that generator A is a onehundred-and-twenty-five-voltmachine and that machines Band B each take sixty-two and one-half voltsand a small current, enough to overcome friction, when there is an equalload on both sides of the three-wire system. If the load on one sideincreases, the field of machine Bis strengthened by the series coil F.The balance between the two armatures is thus destroyed. The machinesbeing mechanically connected, when the field of one is increased it actsas a generator driven by the other machine as a motor, the speed of thelatter machine being maintained constant under its increased load by theincreased voltage due to the compound winding of the generator. Thedifference of potential between main a and neutral wire G is thusincreased by an amount corresponding to the voltage produced by machineB, thus compensating for drop due to the increased load. If the loadonthe other side of the system is increased, the same action takesplace, except that in this case the machine B acts as a generatorinstead of B.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is-

1. In a system of distribution, the combi nation of mains connected tothe source of supply, compensating machines driven by energy derivedfrom said mains and connected across the mains and to a neutralconductor, shunt-field windings for partially exciting said machines,and a series winding on each machine for furnishing the balance of theexcitation.

2. In a system of distribution, the combination of mains connected tothe source of supply, compensating machines driven by energy derivedfrom said mains and connected in shunt across the mains and to a neutralconductor, shunt-field windings connected across the mains for partiallyexciting the compensating machines, a regulating resistance, and aseries winding on each machine, which is connected in circuit with themains leading from the source of supply. 4

3. In a system of distribution, the combination of a generator, mainsconnected therewith, a pair of compensating machines mechanicallycoupled together and driven solely said mains and another of saidwindings in series with another of said mains and a nontral conductorupon which the compensating machines maintain a potential intermediatebetween the potentials of the mains.

In witness whereof I have hereunto set my hand. this 8th day of March,1809.

\VIL LIAM L. .1. EMME'L.

'Witnesses:

BENJAMIN l3. HULL, hIABEL E. JiioonsoNi

